50 Ohm RP-TNC Bulkhead Jack for RG-58 and LMR-195 Coax
The 31-5687: It is a panel-mount bulkhead connector that comes as a kit — the bag includes the jack body, a lockwasher, and a front-side mounting nut, so you have everything to secure it to a panel in one order. The RP-TNC interface is physically identical to a standard TNC but swaps the gender of the center contact: this jack has a male pin, meaning it mates with an RP-TNC plug that has a female socket.
This jack terminates to a specific set of coax cables: RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, and 9907. The shield is crimped, and the center contact can be crimped or soldered — the choice depends on your field tooling and reliability requirements. For a bulkhead install, the connector mounts from the front of the panel with the nut threaded onto the body from the rear; the lockwasher prevents the nut from backing off under vibration. The threaded fastening type gives a secure mate that holds up to 500 mating cycles.
RF Performance: 4 GHz, 0.18 dB Insertion Loss
Insertion loss is specified at 0.18 dB — a tight number that means the connector adds negligible attenuation to the link budget. The voltage rating is 500 V, which is more than enough headroom for the typical RF power levels these cables carry.